JP2001097049A - Battery box structure for electric automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery box structure for an electric automobile having the excellent holding and mounting workability of a battery, and improving battery mounting efficiency. SOLUTION: The peripheral wall of a battery box body 1 has an inner wall 6 and an outer wall 5, and comprises a stay 23 extending over upper surface outer end edges 30b of plural batteries 30 disposed in a line within the battery box 1 along the inner wall 6, a welding nut 22 arranged on an outer surface of the inner wall 6, and a mounting bolt 27 screwed with the nut 22 and threaded between the stay 23 and the nut 22 to press the stay 23 on the upper surface outer end edge 30b of the battery 30 so as to hold the battery 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a battery box structure for an electric vehicle, and more particularly to a battery box structure for an electric vehicle having a double structure of an inner wall and an outer wall.

[0002]

2. Description of the Related Art Conventionally, various methods of mounting a battery on an electric vehicle and wiring methods of a cable have been proposed.

As a conventional method of mounting a battery, for example, as disclosed in Japanese Patent Application Laid-Open No. H10-149805,
A tray is installed in a vehicle compartment, a large number of batteries are fixed on the tray with a holder, and the battery is mounted in the vehicle compartment. Cable wiring of the battery mounted on the tray is performed in the vehicle compartment.

Further, as disclosed in, for example, JP-A-7-156826 and Japanese Utility Model Laid-Open No. 5-122232, a battery box containing a battery is attached to a lower surface of a vehicle body from below, so that the vehicle can be moved into a vehicle interior. In some cases, troublesome operations such as battery loading and battery wiring in a vehicle cabin are eliminated, and the efficiency of battery mounting operation is improved.

However, since the battery box is disposed on the lower surface of the vehicle body, the battery box is required to be waterproof, and has a double structure of an inner wall and an outer wall in order to protect the battery from an impact such as when it is grounded. Something was done.

[0006] The battery box structure of this double structure,
For example, as shown in FIG. 9, a perspective view in which a cover for closing an upper opening is omitted is shown, and a front wall 102 and a rear wall 1 having a double structure including an inner wall and an outer wall are formed along a peripheral edge of a substantially rectangular bottom 101.
Box body 10 with upright wall 03 and left and right side walls 104
0, and a partition 107 extending substantially parallel to the front wall 102 is provided on the bottom 101 so that the inside of the battery box main body 100 is located between the front wall 102 and the partition 107 and between the partition 107 and the rear wall 103. Each of the battery storage positions is defined,
At the respective battery storage positions, the batteries 120 are aligned and arranged along the vehicle width direction in a state where the longitudinal direction of the batteries 120 intersects the extending direction of the partition 107.

The batteries 120 housed in the battery box main body 100 are fixed to the partition 107 by the first stays 108 at the inner edges of the upper surfaces of the batteries 120 aligned in front and rear of the partition 107, respectively. Both ends 109a (only one is shown) of the central part of the upper surface of each of the aligned batteries 120 are pressed and fixed from above by second stays 109 connected to the left and right side walls 104, respectively.

The connecting portion between the side wall 104 and the second stay 109 has a double-walled structure of an inner wall 105 and an outer wall 106 as shown in FIG. Is formed and a bracket 110 is provided on the inner surface of the inner wall 105 substantially corresponding to the upper end of the mounted battery 120.
Are attached by welding or the like, and an attachment bolt 111 is attached and supported by the bracket 110.

On the other hand, the end 109a of the second stay 109
Is formed so that both ends are raised, a bolt hole (not shown) is formed, and the nut 112 is attached to the inner wall 105 via the mounting bolt 111 and the bracket 110.
Is concluded.

[0010]

According to the battery box structure described above, the second stay 109 is provided at each end portion 109 thereof.
a is fixed to the left and right side walls 104 via the brackets 110, respectively, so that the holding force of the battery 120 disposed at the central portion relatively far from the side walls 104 due to the bending of the second stay 109 and the like is reduced. There is concern about the decline.

Further, since the bracket 110 for mounting and supporting the second stay 109 is protruded inward from the inner surface of the inner wall 105, it is necessary to mount the battery 120 at a position distant from the side wall 104. Battery 120
A space is required between them, and the mounting efficiency of the battery 120 is reduced, and the size of the battery box body 100 is inevitably increased.

Further, since the bracket 110 protrudes inward, the batteries 120 adjacent to each side wall 104 are
It is difficult to carry it into a predetermined position from directly above,
The battery 120 adjacent to the battery 04 must be mounted prior to the other batteries 120. When the battery 120 is removed, the battery 120 is removed last. There is a concern that this will affect efficient battery mounting and battery replacement work.

Further, the load from the battery 120 acts in a direction in which the bracket 110 is separated from the inner wall 105, which is not preferable in terms of the mounting and supporting strength of the bracket 110.

Further, the cable 115 connecting the terminals of the battery 120 is connected to the bracket 110 or the second stay 109.
Since the cable is routed over the cable, there is a concern that the outer cover of the cable 115 may be damaged.
Need a protector to protect the
15 needs to be wired around.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a battery box structure for an electric vehicle which is excellent in holding and mounting workability of a battery and which can improve mounting efficiency of a battery.

[0016]

According to a first aspect of the present invention, there is provided an electric vehicle battery box structure for accommodating a plurality of batteries. A battery box body and an outer holder in which a peripheral wall of a double structure having a space formed by an inner wall and an outer wall is erected,
The outer holder includes a stay extending over the upper outer edge of each of the plurality of batteries aligned in the battery box main body, and a plurality of batteries arranged via a bracket in the space. A nut is provided, and a plurality of mounting bolts are provided between the stay and the nut to press the stay on the outer edge of the upper surface of the battery.

According to the first aspect of the present invention, the brackets and nuts for fixing the mounting bolts for supporting the stay for holding the battery are provided in the space between the inner and outer walls of the peripheral wall. Each battery can be mounted close to the inner wall without being affected by the brackets and nuts, improving the mounting efficiency of the battery and reducing the size of the battery box body. The space occupied by the box can be reduced. Furthermore, each battery can be carried into and out of the battery main body from directly above, and the efficiency of battery mounting and replacement work can be improved without restriction on the order of mounting and removing each battery.

Further, it is possible to eliminate the stay which is disposed transversely on the center of the upper surface of the battery as in the prior art, thereby facilitating battery wiring and avoiding cable damage.

Further, by arranging a plurality of mounting bolts and nuts, it is possible to fasten the stay via the mounting bolt at a position close to each battery, for example, so that bending of the stay is prevented, and each battery is prevented from being deformed. Is ensured.

According to a second aspect of the present invention, in the battery box structure for an electric vehicle according to the first aspect, the bracket is mounted and supported on an outer surface of the inner wall.

According to the second aspect of the present invention, since the bracket for supporting the nut is disposed on the outer surface of the inner wall, the load from the mounting bolt for fixing the stay acts in a direction in which the bracket is pressed against the inner wall, and the bracket is moved. Stably held on the inner wall.

According to a third aspect of the present invention, in the battery box structure for an electric vehicle according to the first or second aspect, the stay extends over an upper edge of each of the plurality of aligned batteries. An L-shaped stay body having an existing battery pressing portion and an inner wall pressing portion bent at a side end of the battery pressing portion and extending along the inner surface of the inner wall; A connecting portion provided between the end portions of the portion and the inner wall pressing portion, and a bolt insertion hole formed correspondingly to the connecting portion and the stay body, and a bolt insertion hole is formed in the inner wall. The mounting bolt is inserted from a bolt insertion hole drilled in the connecting portion, and penetrates the bolt insertion hole drilled in the stay body and the inner wall and is screwed to the nut to screw the stay. On the outer edge of the upper surface of the battery and inside the inner wall Wherein the allowed to pressed against the.

According to a third aspect of the present invention, since the stay includes the stay body having the battery pressing portion and the inner wall pressing portion and the connecting portion, the stay is attached to the upper outer edge of the battery and the inner wall by the mounting bolt. The battery is held in a stable state by being pressed against the inner surface, and the mounting bolt can be easily arranged by forming the bolt insertion hole in each member.

According to a fourth aspect of the present invention, in the battery box structure for an electric vehicle according to any one of the first to third aspects, the stay has a spacer which is fitted into a gap between the adjacent batteries.

According to the fourth aspect of the present invention, since the spacer is fitted into the gap formed between the adjacent batteries, even when an impact load is applied to the battery box,
Each battery can be stably held.

According to a fifth aspect of the present invention, in the battery box structure for an electric vehicle according to any one of the first to fourth aspects, the mounting bolts are arranged so as to pass through gaps between the aligned batteries. It is characterized by.

According to the fifth aspect of the present invention, by inserting the mounting bolt through the gap between the adjacent batteries,
It is possible to increase the inclination angle of the mounting bolt, that is, to approach the upright state, to suppress the height of the stay, and to set the bracket at a relatively low position. And the need to consider the contact between the battery and the mounting bolts is eliminated, and by appropriately setting the inclination angle of the mounting bolts, an appropriate battery holding force can be obtained. Is enlarged.

According to a sixth aspect of the present invention, there is provided the battery box structure for an electric vehicle according to the first to fifth aspects, further comprising:
The battery box body includes a partition and an inner holder for partitioning the inside of the battery box into a plurality of battery storage positions, and the inner holder includes:
A stay having a gap between the end and the peripheral wall and extending over an inner edge of an upper surface of each of the plurality of batteries aligned with the battery storage position; It is characterized by having attachment means for pressing against the one edge and attaching to the partition.

According to a sixth aspect of the present invention, the inside of the battery box body is divided into a plurality of battery mounting positions by partition walls, and the outer edges of the upper surface of the batteries arranged in a row are held by the outer holder. Since the inner edge of the upper surface is held by the inner holder, a stay or the like that holds the battery across the upper surface of the battery becomes unnecessary, and a cable wiring space is provided between the stay end of the inner holder, the peripheral wall, and the gap. This eliminates the need to route the cable over the stay or the like, and prevents the cable from being damaged due to the contact with the stay.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the battery box structure for an electric vehicle according to the present invention will be described below.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. Note that the arrow F in the figure indicates the forward direction of the vehicle body.

FIG. 1 is a perspective view omitting a cover for closing an opening opening above a battery box main body 1 mounted on a lower surface of a vehicle body, and FIG. 2 is a sectional view taken along the line II of FIG.

The battery box main body 1 has a substantially rectangular bottom portion 2, and along each edge of the bottom portion 2, a double side wall 3, a front wall 4, and a rear wall 7 each having an inner wall and an outer wall. It is box-shaped with the surrounding wall standing upright.

The front wall 4 includes an outer wall 5 formed by bending an edge of the bottom 2 upward, and an inner wall 6 opposed to the outer wall 5.
The upper portion of the outer wall 5 is bent inward and further bent upward to extend the flange 5a to the upper edge, while the lower end of the inner wall 6 is connected to the bottom portion 2. In addition, a stepped battery mounting portion 6b is formed, and an upper end 6a is connected to a flange 5a of the outer wall 5 to form a space 4A by the outer wall 5 and the inner wall 6.

Similarly to the front wall 4, the rear wall 7 has a double structure including an outer wall 8 and an inner wall 9 formed by bending the edge of the bottom 2 upward. Bent inward,
And it is bent further upward to form a flange 8a at the upper edge. On the other hand, the inner wall 9 has a lower end joined to the bottom 2 and a stepped battery mounting portion 9b formed, and an upper end 9a joined to the flange 8a to form a closed space having a closed cross-sectional shape by the outer wall 8 and the inner wall 9. 7A are formed.

On the bottom portion 2, there are provided partition walls 10, each end of which is connected to the left and right side walls 3 and wrapped around the bottom portion 2 to partition the inside of the battery box body 1.

The partition 10 has a flat top end 10a, a substantially U-shaped cross section in which both sides of the top end 10a are bent downward, a lower end connected to the bottom 2 and a stepped battery mounting near the lower end. A battery storage position A and B are formed between the partition wall 10 and the front wall 4 and between the partition wall 10 and the rear wall 7, respectively, and a front part formed between the partition wall 10 and the front wall 4 is formed. A plurality of batteries 30 are arranged at the battery storage position A along the vehicle width direction with the longitudinal direction of each battery 30 intersecting the extending direction of the partition 10, and formed between the partition 10 and the rear wall 7. In the rear battery storage position B, a plurality of batteries 30 are arranged and stored along the vehicle width direction with the longitudinal direction of each battery 30 intersecting the extending direction of the partition wall 10.

The partition walls 10 of the batteries 30 aligned at the front battery storage position A and the rear battery storage position B
Holder 1 for fixing the upper inner edge 30a adjacent to the inner side
5 and an outer holder 20 for fixing the upper outer edge 30 b adjacent to the front wall 4 and the rear wall 7 of each battery 30 to the front wall 4 and the rear wall 7.

The inner holder 15 is provided between the batteries 30 arranged at the front battery storage position A and the rear battery storage position B, and the base 1 fitted along the partition wall 10.
6a, and a substantially hat-shaped cross section 16 having a holding portion 16b which is formed on both sides of the base portion 16a and which can be in contact with the upper inner edge 30a of each battery 30 from above,
By fixing the stay 16 to the top portion 10a of the partition wall 10 with mounting means, for example, mounting bolts 17, the upper inner edge 30a of each battery 30 aligned with the front battery storage position A and the rear battery storage position B is aligned. Positioned and fixed.

The both ends 16e of the stay 16 and the side wall 3
Are separated from each other by a dimension that allows the wiring of the battery wiring cable 18, and a cable wiring space is formed between the side wall 3 and the end 16 e of the stay 16.

Next, the outer holder 20 will be described. In the description of the outer holder 20, each battery 3
0 is fixed to the front wall 4 and the rear wall 7,
Since the configuration is the same, the battery 3 is attached to the front wall 4 for convenience of explanation.
Only the outer holder 20 for fixing 0 will be described.

The outer holder 20 has a space formed by the outer wall 5 and the inner wall 6 as shown in FIG. 3 which is an enlarged sectional view taken along the line II in FIG. 2 and FIG. Part 4A
Inside, a bracket 21 attached to the outer surface of the inner wall 6 and supporting the welding nut 22, and a stay 2 supported by the bracket 21 by mounting bolts 27 and the like.
3 and so on.

The bracket 21 is mounted on the outer surface of the inner wall 6 substantially corresponding to each battery 30 to be mounted.
As the bracket 21 descends, the inner wall 6 gradually increases.
21a and support 2 that are inclined away from
1a has a generally V-shaped cross section having a fixing portion 21b gradually approaching the inner wall 6 as it goes down from the lower end thereof, and extends upward from the upper end of the support portion 21a and downward from the lower end, respectively. A mounting flange 21c is formed by welding or the like, a bolt insertion hole 21e is formed in the fixing portion 21a, and a welding nut 22 is formed on the lower surface of the fixing portion 21a corresponding to the bolt insertion hole 21e.
Are welded.

On the other hand, the stay 23 is formed by a battery pressing portion 24a capable of abutting from above on the outer edge 30b of the upper surface of the battery 30 to be mounted, and is bent upward from a side end of the battery pressing portion 24a. A main body 24 having a substantially L-shaped section and extending with an inner wall pressing portion 24b capable of abutting against the inner surface of the inner wall 6, and a main body 2 corresponding to the bracket 21.
4, a plate-like connecting portion 25 provided between the respective edges of the battery pressing portion 24a and the inner wall pressing portion 24b.
Is provided with a bolt insertion hole 25e.

Further, when the stay 23 is arranged at the mounting position, the bolt insertion hole 24e is formed in the stay body 24 corresponding to the axis connecting the bolt insertion hole 25e of the connecting portion 25 and the bolt insertion hole 21e of the bracket 21. A bolt insertion hole 6e is formed in the inner wall 6 corresponding to the axis, and the bolt insertion holes 25e, 24e, 6e, 2
1e is set at a position where the mounting bolt 27 which is inserted from the bolt insertion hole 25e of the connecting portion 25 and penetrates each of the bolt insertion holes 25e, 24e, 6e, 21e does not contact the mounted battery 30. .

Next, a description will be given of a battery mounting operation for mounting the battery 30 on the battery box main body 1 configured as described above and a battery removing operation for removing the mounted battery 30.

To mount the battery 30, first, the stay 16 of the inner holder 15 and the stay 23 of the outer holder 20 are mounted.
Is prepared by removing it from the battery box main body 1, and each battery 30 is sequentially loaded from above into the front battery storage position A in a direction in which the longitudinal direction of the battery 30 intersects the extending direction of the partition 10, and Are mounted on the inner wall 6 of the front wall 4 and the battery mounting portions 6b and 10b formed on the partition 10 so as to be bridged and aligned.

When the batteries 30 are carried in and loaded, the brackets 21 are disposed in the space 4A between the inner wall 5 and the outer wall 6, so that the respective batteries 30 are directly above without being affected by the brackets 21 and the like. , And the efficiency of the mounting operation can be improved without restricting the mounting order of the batteries 30.

Similarly, the respective batteries 30 are sequentially placed from above.
The battery 30 is carried into the rear battery storage position B in a direction in which the longitudinal direction of the battery 30 intersects with the direction in which the partition wall 10 extends, and the batteries 30 are mounted on the inner wall 9 of the rear wall 7 and the battery mounting portions 9b and 10b formed on the partition wall 10. It is mounted and arranged so as to hang over.

After aligning the batteries 30 in the front battery storage position A and the rear battery storage position B, the base 16a of the stay 16 forming the inner holder 15 is moved to the front battery storage portion 1A and the rear battery storage portion. 1B, the holding portions 16b are brought into contact with the upper inner edge 30a of the upper surface of each battery 30 from above, and the stay 16 is fixed to the top 10a of the partition 10 by bolts 17. , The upper inner edge 30a of each of the batteries 30 arranged in the front battery storage section A and the rear battery storage section B is positioned and fixed.

The battery pressing portion 24a of the stay 23 of the outer holder 20 is connected to the outer edge 30b of the upper surface of the battery 30.
, And the inner wall pressing portion 24b is brought into contact with the inner surface of the inner wall 6, and the mounting bolt 27 is inserted through the bolt insertion hole 25e formed in each connecting portion 25, and the stay body 2
4, the inner wall 6, the bolt insertion holes 24e, 6e, 21e drilled in the bracket 21 are sequentially penetrated and screwed into the welding nut 22 provided in the bracket 21 to thereby make the battery pressing portion 24a of the stay 23 And the inner wall pressing portion 24b is connected to the upper outer edge 30 of the battery 30.
b. Each battery 30 is fixed to the front battery storage position A by being fastened so as to be pressed against the upper surface and the inner surface of the inner wall 6. In this fixed position, the stay 23 is pressed against the outer edge 30b of the upper surface of the battery 30 and the inner surface of the inner wall 6 and is held in a stable state.

Similarly, in each battery 30 arranged in the rear battery storage position B, the stay 23 of the outer holder 20 is brought into contact with the upper outer edge 30b of the battery 30 and the inner surface of the inner wall 9, Each battery 30 is fixed to the rear battery storage position B by being fastened to the nut 22 provided on the bracket 21 by the mounting bolt 26.

The stays 23 of the outer holder 20 are fastened to the respective brackets 21 by the mounting bolts 27 at positions close to the respective batteries 30.
The respective batteries 30 can be securely fixed without causing the 3 to bend and deform.

The batteries 30 aligned with the front battery storage position A and the rear battery storage position B and fixed by the inner holder 15 and the outer holder 20 are connected to each other by a cable 18.

In this cable wiring, the cable 18 for connecting the battery 30 mounted at the front battery storage position A and the battery 30 mounted at the rear battery storage position B includes the end 16 e of the stay 16, the side wall 3, And each battery 30 has an upper inner edge 30a formed therethrough.
In addition, since the upper outer edge 30b is fixed, a stay that crosses the central portion of the conventional battery upper surface is not required, and the cable 18 does not pass over the stay or the like, and is not wired. The work becomes easier, and damage to the cable 18 is avoided, and the protector and the like of the cable 18 can be eliminated.

To remove the batteries 30 mounted and fixed at the front battery storage position A and the rear battery storage position B, the cable 18 is wired between the batteries 30 and the cable 18 is removed. The stay 16 is removed from the partition wall 10 by loosening the mounting bolt 17 of 15, and the mounting bolt 27 of the outer holder 20 is loosened to remove the stay 23 from the bracket 21 to release the fixing of each battery 30. Subsequently, the batteries 30 mounted in the front battery storage position A and the rear battery storage position B are pulled out and removed.

At the time of removal of the battery 30, when carrying in and mounting the battery 30,
0 can be carried out directly upward, and the efficiency of battery removal work is brought about without being restricted by the carrying out order of each battery 30. In particular, unlike the related art, the battery 30 adjacent to the side wall 3 can be removed independently without affecting other batteries 30, and the work of removing and replacing only the battery 30 can be efficiently performed.

According to the present embodiment, the bracket 21 of the outer holder 20 is disposed between the inner wall 6 and the outer wall 5 of the front wall 4 and between the inner wall 9 and the outer wall 8 of the rear wall 7. The battery 50 can be mounted close to each of the inner walls 5 and 9, so that the space of the portion can be reduced, the size of the battery box body 1 can be reduced, and the space occupied by the battery box can be reduced. At the same time, the height of the battery box main body 1 can be reduced, which is particularly preferable in an electric vehicle in which the battery box is mounted on the lower surface of the vehicle body.

Further, since the bracket 21 is disposed on the outer surfaces of the inner walls 5 and 9, the load from the mounting bolt 26 for fixing the stay 23 acts in the direction of pressing the bracket 21 against the inner walls 5 and 9, Are stably held on the inner walls 5 and 9, and a reduction in required strength of the connection between the bracket 21 and the inner walls 5 and 9 can be obtained.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. The same reference numerals are given to the portions corresponding to FIGS. 1 to 4 to omit detailed description of the portions, and different portions will be mainly described.

In the second embodiment, the battery 30
Are fixed to the front wall 4 and the rear wall 7 and have the same configuration.
The following describes only the outer holder 20 for fixing.

As shown in FIG. 5, a cross-sectional view of a main part of the outer holder 20, and FIG.
It is characterized in that mounting bolts 27 for fixing the stay 23 are arranged so as to pass through the gap between the adjacent batteries 30.

The bracket 21 in this embodiment is
The mounting flange 21c has a substantially V-shaped cross section having a support portion 21a and a fixing portion 21b.
A bolt insertion hole 21e is formed in the
A welding nut 22 is welded to the lower surface of b.

The bracket 21 is mounted at a relatively low position on the outer surface of the inner wall 6, and particularly includes a bolt insertion hole 21e formed in the fixing portion 21b and a welding nut 22 provided corresponding to the bolt insertion hole 21e. Is set at a low position and at a position corresponding to the gap d between the adjacent batteries 30 that are aligned and arranged at a predetermined distance from each other.

On the other hand, the stay 23 is
a and a stay body 24 having a substantially L-shaped cross section and extending with an inner wall pressing portion 24b, and a connecting portion 25 bridged between respective edges of the battery pressing portion 24a and the inner wall pressing portion 24b. have.

The connecting portion 25 is provided with a bolt insertion hole 25e corresponding to the gap d formed by the adjacent batteries 30 and 30 and has a cross section extending substantially vertically at the lower end of the connecting portion 25. U-shaped adjacent batteries 30 and 3
A spacer 26 that can be fitted into the gap d with the second member 0 extends.

Further, when the stay 23 is placed at the mounting position, the stay body 24 and the inner wall 6 are respectively bolted to the stay main body 24 and the inner wall 6 so as to correspond to the axis connecting the bolt insertion hole 25e of the connecting portion 25 and the bolt insertion hole 21e of the bracket 21. Insertion holes 24e and 6e are formed.

Then, the bolt insertion hole 25e of the connecting portion 25 is formed.
The bolts 27 are inserted into the bolt holes 24e of the stay body 24, the gap d between the batteries 30 and 30, the bolt holes 6e of the inner wall 6, and the bolt holes 2 of the bracket 21.
The outer edge 30b of the upper surface of each battery 30 is fixed by being fastened to the welding nut 22 through 1e.

According to the second embodiment configured as described above, in addition to the first embodiment, the mounting bolt 27 is inserted into the gap d between the adjacent batteries 30, so that the mounting bolt 27 is The connecting portion 2 of the stay 23 is arranged in an upright state compared to the first embodiment.
4, the height h of the stay 23 is suppressed, the bracket 21 can be set at a relatively low position, and the height of the battery box body 1 projecting upward from the battery 30 H is reduced, the height of the entire battery box body 1 can be suppressed, and mounting under the vehicle body floor becomes easier.

Further, it is not necessary to consider the contact between the battery 30 and the mounting bolt 27, and a suitable holding of the battery 30 can be obtained by appropriately setting the inclination angle of the mounting bolt 27. Degree expansion is brought.

Further, even when the spacer 26 is fitted in the gap d between the batteries 30 and an impact load is applied to the battery box main body 1, the holding force of each battery 30 is obtained and the battery 30 is stably held. be able to. The spacer 26 can be formed on the stay body 24 instead of the connecting portion 25.

The brackets 2 supporting the stays 23 corresponding to the respective gaps d between the adjacent batteries 30 are provided.
7 and FIG. 8 without disposing the mounting bolts 27 and the like, and disposing them at every gap d between the equally spaced batteries 30, as shown in FIG. By doing so, the configuration can be simplified.

The present invention is not limited to the above embodiment, but can be variously modified without departing from the spirit of the invention. For example, a plurality of partition walls may be provided to further add a battery storage position between the front battery storage position 1A and the rear battery storage position 1B, and the stay 16 of the inner holder 15 and the stay of the outer holder 20 may be provided. 23 can be divided into a plurality of stays of appropriate length.
It is also possible to change the shape of the brackets 6, 23 and the bracket 21. Further, the partition is extended between the front wall and the rear wall in the front-rear direction, and the inner holder is arranged along the partition. It is also possible to arrange outer holders along the left and right side walls.

[0074]

According to the battery box structure for an electric vehicle according to the present invention described above, the brackets and nuts for fixing the mounting bolts for supporting the stay for holding the battery are disposed in the space between the inner wall and the outer side. From this, it becomes possible to mount each battery close to the inner wall,
The battery mounting efficiency is improved, the size of the battery box body is reduced, and each battery can be loaded and unloaded from directly above, and the order of loading and removing each battery is restricted. And the efficiency of mounting work is improved.

In particular, by inserting the mounting bolt through the gap between the adjacent batteries, the inclination angle of the mounting bolt can be set to a large value. As a result, the height of the stay is suppressed and the bracket is moved to a relatively low position. The height of the battery box body can be suppressed, and the inclination angle of the mounting bolt can be set appropriately without considering the contact between the battery and the mounting bolt. The degree of freedom in the design of the battery box is increased, for example, the holding power of the battery is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a battery box showing an outline of a first embodiment of a battery box structure for an electric vehicle according to the present invention.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is an enlarged view of a portion II in FIG. 2;

FIG. 4 is a view as viewed in the direction of the arrow III in FIG. 3;

FIG. 5 is a cross-sectional view of a main part showing an outline of a second embodiment of the battery box structure for an electric vehicle according to the present invention.

FIG. 6 is a view taken in the direction of arrow IV in FIG. 5;

FIG. 7 is an explanatory view showing an alignment position of a battery and an arrangement state of mounting bolts.

FIG. 8 is an explanatory view showing an alignment position of a battery and an arrangement state of mounting bolts.

FIG. 9 is a perspective view showing an outline of a conventional battery box.

FIG. 10 is a sectional view taken along line VV of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery box main body 2 Bottom part 3 Side wall (peripheral wall) 4 Front wall (peripheral wall) 4A space part 5 Outer wall 6 Inner wall 6e Bolt insertion hole 7 Rear wall (peripheral wall) 7A Space part 8 Outer wall 9 Inner wall 10 Partition wall 15 Inner holder 16 Stay 16e End part 17 Mounting bolt (mounting means) 18 Cable 20 Outer holder 21 Bracket 21e Bolt insertion hole 22 Welding nut 23 Stay 24 Stay body 24a Battery pressing part 24b Inner wall pressing part 24e Bolt insertion hole 25 Connecting part 25e Bolt insertion Hole 26 Spacer 27 Mounting bolt 30 Battery 30a Upper inner edge 30b Upper outer edge A Front battery storage position (battery storage position) B Rear battery storage position (battery storage position)

Claims (6)

[Claims] 1. A battery box structure for an electric vehicle accommodating a plurality of batteries, wherein a double-walled peripheral wall having a space formed by an inner wall and an outer wall is provided along an edge of a bottom. A main body and an outer holder, wherein the outer holder includes a stay extending over an upper outer edge of each of the plurality of batteries aligned in the battery box main body; and a bracket in the space. And a plurality of mounting bolts provided between the stays and the nuts to press the stays on the outer edges of the upper surface of the battery. Battery box structure for electric vehicles. 2. The battery box structure for an electric vehicle according to claim 1, wherein the bracket is mounted and supported on an outer surface of the inner wall. 3. The battery press contact portion extending over the outer edge of the upper surface of each of the plurality of aligned batteries, and the stay is bent at a side end of the battery press contact portion. A stay body having a substantially L-shaped cross section having an inner wall pressing portion extending along the inner surface of the inner wall; a connecting portion bridged between each edge of the battery pressing portion and the inner wall pressing portion; And a bolt insertion hole drilled corresponding to each of the section and the stay body, a bolt insertion hole is drilled in the inner wall, and the mounting bolt is inserted from a bolt insertion hole drilled in the connection portion. And, it is characterized in that the stay is screwed into the nut through a bolt insertion hole formed in the stay main body and the inner wall to press the stay on the outer edge of the upper surface of the battery and the inner surface of the inner wall. The battery box for an electric vehicle according to claim 1 or 2, Box structure. 4. The battery box structure for an electric vehicle according to claim 1, wherein the stay has a spacer that fits into a gap between adjacently disposed batteries. 5. The battery box structure for an electric vehicle according to claim 1, wherein the mounting bolts are arranged so as to penetrate a gap between the aligned batteries. 6. The battery box according to claim 1, further comprising a partition partitioning the inside of the battery box body into a plurality of battery storage positions, and an inner holder, wherein the inner holder has a gap between an end and the peripheral wall, and A stay that extends over the inner edge of the upper surface of each of the plurality of batteries aligned with the battery storage position; mounting means for pressing the stay against the inner edge of the upper surface of the battery and attaching to the partition; The battery box structure for an electric vehicle according to any one of claims 1 to 5, wherein